The International Energy Conservation Code (IECC) prototype building models (prototype models) were developed by Pacific Northwest National Laboratory (PNNL), in support of DOE's Building Energy Codes Program (BECP), to simulate energy savings associated with changes in energy codes and standards. For residential buildings, PNNL utilized two base prototypes to simulate both Single-family detached house, and Multi-family low-rise apartment building types. Energy models for the 2006, 2009 and 2012 versions of the IECC are available for each state.

This set of IECC Prototype Building Models is for the state of Texas, using the 2006 IECC as the baseline code.

This analysis of residential energy code compares the requirements of the 2009 International Energy Conservation Code (IECC) with the residential code—or typical construction practice in the absence of a code—in most states as of June 2009. The results, which include estimated typical energy savings of updating each state’s code to the 2009 IECC, are provided in chapters specific to each state.

Several states have either not adopted a mandatory energy code or developed their own codes which have minimal or no connection to the IECC. The latter—including California, Florida, Oregon, and Washington— were not included in this analysis because the codes in these states would be difficult to appropriately compare to the 2009 IECC and most of these states have energy offices that have already assessed the IECC on their own.

Pacific Northwest National Laboratory (PNNL) conducted a series of cost effectiveness analyses for the U.S. Department of Energy (DOE), covering the 2009 and 2012 editions of the International Energy Conservation Code (IECC) for new single and multifamily homes. The evaluations were performed against a 2006 IECC baseline, taking state-specific code amendments into consideration. These reports outline the results of these analyses, including a National Cost Analysis and Cost Analyses for selected states.

These analyses evaluate the cost-effectiveness of the prescriptive path of the 2015 edition of the International Energy Conservation Code (IECC), relative to the 2006 IECC for all 50 states and the District of Columbia. The analysis covers one- and two-family dwelling units, town-homes, and low-rise multifamily residential buildings covered by the residential provisions of the 2015 IECC. These reports were originally published in October 2015, and updated in February 2016 to update numbers reported in certain results tables.

A research project in the state of Texas identified opportunities to reduce homeowner utility bills in residential single-family new construction by increasing compliance with the state energy code. The study was initiated in October 2014; data collection began in March 2015, and continued through October 2015. During this period, research teams visited 133 homes in 30 counties in and around Houston during various stages of construction, resulting in a substantial data set based on observations made directly in the field. Stakeholders in the state agreed that these 30 counties represented the levels of energy codes and enforcement seen across the state. Analysis of the data has led to a better understanding of the energy features present in homes, and, when extrapolated across the entire state, indicates over $16 million in potential annual savings to Texas homeowners that could result from increased code compliance. Public and private entities within the state can use this...

The Texas State Energy Conservation Office (SECO)adopted the 2015 IECC effective Nov. I, 2016, for all commercial and residential buildings greater than three stories above grade and for state-funded buildings SECO adopted the ASHRAE Standard 90.1-2013, with an effective date of June I, 2016.

For residential buildings, Texas Governor Greg Abbott signed HB 1736 on June 16, 2014 moving the state's single-family residential energy code from the 2009 code to the 2015 International Residential Code (IRC), Chapter 11, effective September I, 2016. The Texas state legislature modified the 2015 IRC Energy Rating Index scores to a set of scaled scores that increases in stringency over time.

The State of Texas, in compliance with the Energy Conservation and Production Act (ECPA) of 1976, as amended, has reviewed the provisions of ASHRAE 90.1-2007 for energy efficiency in commercial buildings. The Texas State Energy Conservation Office adopted teh 2009 IECC effective April 1, 2011 for all commercial and residential buildings greater than three stories above grade. A study done by the Energy System's Laboratory of Texas A&M University deomstrates that the 2009 IECC code results in equivalent overall energy savings performance when compared to ASHRAE Standard 90.1-2007 for large office buildings in Texas.

The Texas State Energy Conservation Office, which has the statutory authority to adopt the latest energy codes in Texas, asdopted the 2009 IECC effective April 1, 2011 for all commercial and residential buildings greater than three stories.